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Well, I think a computer chess program constitutes much prior human
thinking beforehand, so ultimately, it is still human vs. human, the
player vs. the programmer. Further, the machine or program is dedicated to
solving the chess problem at hand, not really to defeating an opponent, in
a rather cold way, because, having no 'life,' it doesn't really care if
it loses and isn't subject to the many distractions and self-defensive or
wilfully aggressive exercises of will that color human decision-making. 
The human playing against a machine pits some 3 trillion neurons against x
number of bytes, which would seem to be a huge advantage for the human, but
focusing enough of them while ignoring distractions of life via other
sensory inputs makes it tougher.
  Maybe a sensory deprivation chamber and memory wipe would help.